Research on domestic PV module structure based on fault detection

As to detecting the location of fault in photovoltaic (PV) module structure, this paper presents a new type of PV arrays connection: CTCT structure (complex-total-cross-tied array). In the array of CTCT-type PV cells, by adding a certain number of current sensors and comparing the detected current, the Hot Spot cells can be located to avoid their damage to PV panels. This paper derives a formula to demonstrate the relationship between the total number of PV panels in parallel, the resolution and the total number of current sensors in the PV systems. And the algorithm has been verified correctly in a 3*9 board of PV panel. With the certain number of PV panels, selecting the reasonable value of resolution for determining the number of sensors needed, we can detect the precise location of PV cells that have Hot Spot by using current sensors as few as possible.